What is an ICP?

ICP stands for Ideal Customer Profile. It is the description of the type of company most likely to buy your product, get genuine value from it, and stay a long-term customer. It is the most important document in B2B sales — and the most commonly wrong one.

Cameron Evans · Founder & CEO, Haku

30 April 2026 · 4 min read

The ICP is not a target list. It is the criteria used to build one. Every outbound decision — which accounts to prospect, which signals to monitor, which messages to write — flows from the ICP. A tight, evidence-based ICP produces campaigns that resonate. A loose, assumption-based ICP produces generic outreach that nobody responds to.

The three layers of a strong ICP

The wrong ICP vs the right one

How to build an ICP from evidence — not assumptions

Why most ICPs fail

The most consistent ICP failure is building it from assumptions about who might buy rather than evidence about who does buy. Teams describe their ICP as "mid-market B2B companies" — which is a category, not a profile. They write messaging for that category, which resonates with no specific subset of it.

The second most common failure is building the ICP once and never updating it. As a company scales, the buyer profile changes — what worked at £1M ARR may not be the right ICP at £5M. The ICP should be rebuilt from closed-won data at least annually, and whenever the close rate drops significantly.

The third failure is treating the ICP as a demographic exercise and ignoring the trigger layer entirely. The most predictive element of an ICP is not who the company is — it is what just happened to them. A company that just raised a funding round and matches every other ICP criteria is worth contacting this week. The same company 12 months before the round, with identical demographics, is a monitoring queue entry, not an active sequence.